Fort de Bertheaume, Coastal fortress in Plougonvelin, France.
The fortress stands on a rocky islet connected to the mainland by a footbridge, rising 37 meters above the Iroise Sea entrance.
Military engineer Vauban constructed this strategic defense post in 1690 under Louis XIV orders to protect the naval base of Brest from maritime invasions.
The fortification includes three sections from different periods: medieval foundations, 17th-century military architecture, and 19th-century additions with casemates.
Visitors can access guided tours in July and August, with adventure activities including a 200-meter zip line suspended over the water.
The fort repelled an English fleet attack in 1694 through heavy cannon fire from its upper platform equipped with three cannons and two mortars.
Location: Plougonvelin
GPS coordinates: 48.33694,-4.69758
Latest update: June 23, 2025 09:43
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